US Bridges

Nfa 2615 (sa 4607) over Roan Creek

Good

Johnson County, Tennessee · Dug Hill Rd-S of Mtn City · Structure no. 46026150001

Built
2010
15 years old
Condition
Good
inspected April 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
606
2021 count
Owner
County
County Highway Agency

About this bridge

Nfa 2615 (sa 4607) over Roan Creek is a prestressed concrete box beam or girders - single or spread carrying Nfa 2615 (sa 4607) over Roan Creek in Johnson County, Tennessee. It was built in 2010, so it is 15 years old, younger than the Tennessee average of 47.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 606 vehicles a day, roughly 3% of them trucks, projected to reach 970 by 2042. The structure is 70 ft (21.3 m) long and 30 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNfa 2615 (sa 4607)
CrossesRoan Creek
LocationDug Hill Rd-S of Mtn City
RouteCounty Highway 2615
CountyJohnson County
StateTennessee
Coordinates36.43005, -81.80272
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic606 (2021)
Projected traffic970 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nfa 2615 (sa 4607) over Roan Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is Nfa 2615 (sa 4607) over Roan Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Nfa 2615 (sa 4607) over Roan Creek carry?

About 606 vehicles per day (2021 count), of which roughly 3% are trucks.

How long is Nfa 2615 (sa 4607) over Roan Creek?

The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns Nfa 2615 (sa 4607) over Roan Creek?

It is owned by the County Highway Agency.